A lightsaber trident, or a trident lightsaber, is a long-handled lightsaber variation that emits three blades. A lightsaber trident is not currently part of Star Wars Canon or Star Wars Legends.
A lightsaber trident shares design similarities with the three-bladed crossguard lightsaber. Some trident lightsabers could be considered a crossguard lightsaber variation. A lightsaber trident is often depicted as using an extremely long handle, like a pike. Additionally, the side blades on a lightsaber trident, which are shorter than the main blade, are commonly slanted at a 45 degree angle or more or situated to run parallel to the main blade.
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Although a lightsaber trident is neither part of Star Wars Canon or Star Wars Legends, Hasbro’s officially licensed Star Wars BladeBuilders Lightsaber Toy Line allows builders to construct a lightsaber trident using mix-and-match parts from the product line.
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Several custom saber companies have made trident style lightsabers. Saberforge Paladin and Saberforge Triton are two custom sabers with angled crossguards. Other custom saber companies have made one-off custom lightsaber tridents. Crosspoint Sabers made a long-handled lightsaber trident.

COVER IMAGE CREDIT Hasbro
Image depicts a Hasbro Star Wars BladeBuilders Jedi Master Lightsaber Set